Whip about to meet pair of Liberals getting derisive comment (7)
I believe the answer is:
catcall
'derisive comment' is the definition.
'whip about to meet pair of liberals' is the wordplay.
'whip' becomes 'cat' (cat o' nine tails, cat for short is a type of whip).
'about to' becomes 'ca' (I've seen this in other clues).
'meet' is a charade indicator (letters next to each other).
'pair of' indicates the doubling of some letters (I've seen 'pair' mean this).
'liberals' becomes 'l' (this might be a standard abbreviation I've not previously seen).
'l' duplicated is 'll'.
'cat'+'ca'+'ll'='CATCALL'
'getting' is the link.
(Other definitions for catcall that I've seen before include "Feline whistle of disapproval" , "Derisive cry" , "Mocking shout or whistle" , "Shout of derision" , "Boo" .)